Graphical user interface for a display screen of a computing device



FIG. 1 is a front view of a graphical user interface for a display screen of a computing device;

FIG. 2 is a front view of a second embodiment thereof; and,

FIG. 3 is a front view of a third embodiment thereof.

The broken lines shown in all views of the display screen of a computing device and of graphic elements and text within the graphical user interface form no part of the claimed design. 

The ornamental design for a graphical user interface, as shown and described. 